1. Department of Primary Health Care and Public Health, Faculty of Medicine Foca, University of East Sarajevo, 73300 Foca, Bosnia and Herzegovina
2. Institute for Medical Statistics and Informatics, Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
3. Department of Pediatrics, Faculty of Medicine Foca, University of East Sarajevo, 73300 Foca, Bosnia and Herzegovina
4. Department of Social Medicine, Faculty of Medical Sciences, University of Kragujevac, 34000 Kragujevac, Serbia
5. Department of Internal Medicine, Faculty of Medicine Foca, University of East Sarajevo, 73300 Foca, Bosnia and Herzegovina
6. Department of Internal Medicine, Division of Nephrology and Hypertension, Mayo Clinic, Rochester, MN 55902, USA